Because rather than it being a private matter, that could possibly have been resolved privately, all his or her sailing friends will now know. Maybe as a child you'd have liked that. A few might. Personally I'd have been mortified. I'd have never have gone near a sailing club again.
If the parents had chosen to publicise this, I would not have criticised them, that's a choice they would have been entitled to make. What has instead happened is that someone not directly connected to the family has taken it on themselves to do so. Inevitably, the dots have been joined up to identify the child and the situation is escalating.
I've expressed my opinion over a number of posts here and I'm done. I hope SA deletes this thread though I don't expect they will.